NOAA/Systems Acquisition Office (SAO), 1315 E. W. Highway, Mail Code SAOX2, Silver Spring, MD 20910

59 -- VHF ANTENNA MARKET SURVEY/RFI FOR NOAA/IPO: CLARIFICATION OF 7/18 CBD SOL RFI: JM/IPO/VHF DUE 081597 POC Jay W. Moore, NOAA/IPO, 8455 Colesville Road, RM 1450, Mail Stop E/IPO, Silver Spring, MD 20910; 301-427-2126x112 E-MAIL: Contracting Officer, jmoore@ipo.noaa.gov. This is a FOLLOW-UP to the market survey and request for information (RFI), which appeared in the CBD on July 18, Category 59, requesting pricing and products for VHF antennae to support polar, sun synchronous satellites owned by the U. S. Government, National Oceanic and Atmospheric Administration (NOAA). This is a solicitation for information or planning purposes under FAR 52.215-3. Potential interested vendors are encouraged to contact the POC directly to solicit any questions, via internet: jmoore@ipo.noaa.gov, or to call Howard Kea at 301-427-2080, ext. 149. The Government also encourages potential vendors to submit budgetary pricing data for planning purposes. This CBD hereby clarifies the previous CBD survey requirement of 7/18/97. Any changes made by this clarification replace the previous information. CLARIFICATIONS: Interested vendors may propose separate uplink and downlink antennae. The following antenna specifications are pulled from the TIROS-N Satellite -Ground System, Interface Control Document, as amended. (I). CDA RECEPTION PARAMETERS: (A) TIP DATA: Type of Received Signal: VHF, PM/S0, 8.32 Kbps; Frequency, MHZ: 136.77 or 137.77; Polarization of Spacecraft Tx'd Signal: Linear; Ground Antenna System Characteristics: Gain, dbi: 27.6; Polariz. Comb. Loss, db: 0.2; Total Sys. Noise Temp., degrees K, 5 degrees elevation, Best/Worst case: 1801/2102; Rcvr Characteristics: IF Bandwidth, MHZ: 0.100; AGC Spped, Msec: 30; Loop BW/Track BW, Hz: 30; TLM Demod/Demod Sel: Synch PM/PM; Tuning Mode: Closed Loop; VCO Range/VCO Sel., Khz: 15; Video Bandwidth: 30. (B) APT DATA: Type of Received Signal: VHF, FM/AM, 2.4 Khz Sub-carrier; Frequency, MHZ: 137.50 or 137.62; Polarization of Spacecraft Tx'd Signal: RCP; Ground Antenna System Characteristics: Gain, dbi: 27.6; Polariz. Comb. Loss, db: 0.2; Total Sys. Noise Temp., degrees K, 5 degrees elevation, Best/Worst case: 1801/2102; Rcvr Characteristics: IF Bandwidth, MHZ: 0.060; AGC Spped, Msec: 30; Loop BW/Track BW, Hz: NA; TLM Demod/Demod Sel: FM; Tuning Mode: Fixed; VCO Range/VCO Sel., Khz: 15; Video Bandwidth: 5. (II). COMMAND RECEPTION PARAMETER SUMMARY: (The "Type of Received Signal" precedes data immediately following it in the form of "VHF, ternary FSK-AM, 1 kbps"). System Input: Frequency, MHZ: 148.56 +- 0.002; Noise Temp., degrees K: 10,160/12,860 (Note 2); Req'd EIRP for BER = 1 x 10 -6 (exponent factors), spacecraft stabilized: -87.0 dbm (Note 1); Antenna: Min Gain over +- 63 degree cone: -14 dbi (Note 1); Min Gain over 90 % sphere of sphere: -18 dbi (Note 1); Polarization: Linear; Antenna Receiver Circuit Loss: 6.6 db; VSWR Loss: 0.4 db; Receiver: Sensitivity (for BER = 10 -6 (exponent factors): -108 dbm; Squelch (no cmd output): -112 dbm; Noise Figure: 7.0 db; Preselector Bandwidth, 1db: 50 kHZ, Min, 60 db: 65 MHZ, Max; IF Bandwidth, 3 db: 42 kHZ, Min, 60 db: 125 kHZ, Max; Clock Bandwidth: 60 HZ, Max; Acquisition Time, msec: 20, Max; Deactivation Time, msec: 20, Max; Modulation: Carrier Mod. Index: 85 +- 5 %; Tone AM index due to clock: 50 +- 10 %; FSK Tone Freq., kHZ: 8 (0), 10 ($), 12 (1), +- 0.00; Clock Freq., kHZ: 1 +- 0.001. Decoder criteria can be supplied upon request. Note 1: From a right circularly polarized source antenna; Note 2: Noise referenced to antenna terminals; 10,160 includes 300 degree K avg galactic noise; 12,860 includes 3000 degree K max galactic noise. Note 3: The decoder will only accept commands from the Command Receiver-Demodulator during the Command Access Period (CAP). We are considering both helix and omni-directional antennae. The Government is not obligated to award a contract on the basis of this solicitation. All responsible and capable vendors will be considered in any follow-on RFP. All serious responses to this request will be considered We request your response as soon as possible. (0211)

Loren Data Corp. http://www.ld.com (SYN# 0347 19970804\59-0015.SOL)